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  2. Covering graph - Wikipedia

    en.wikipedia.org/wiki/Covering_graph

    For any connected graph G, it is possible to construct its universal covering graph. [3] This is an instance of the more general universal cover concept from topology; the topological requirement that a universal cover be simply connected translates in graph-theoretic terms to a requirement that it be acyclic and connected; that is, a tree. The ...

  3. Post (structural) - Wikipedia

    en.wikipedia.org/wiki/Post_(structural)

    Story – A post only one story tall as in "storeyed construction" [12] also known as platform framing. Prick – 1) Same as story post, a one-story post for extra support at a particular location; 2) In a roof truss a side post. [13] Ridge – A post extending from the ground or foundation to the ridge beam.

  4. Covering space - Wikipedia

    en.wikipedia.org/wiki/Covering_space

    If : ~ is a covering, (~,) is said to be a covering space or cover of , and is said to be the base of the covering, or simply the base. By abuse of terminology , X ~ {\displaystyle {\tilde {X}}} and p {\displaystyle p} may sometimes be called covering spaces as well.

  5. Universal covering group - Wikipedia

    en.wikipedia.org/wiki/Covering_group

    The rotation group SO(3) has as a universal cover the group SU(2), which is isomorphic to the group of versors in the quaternions. This is a double cover since the kernel has order 2. (cf the tangloids.) The unitary group U(n) is covered by the compact group T × SU(n) with the covering homomorphism given by p(z, A) = zA. The universal cover is ...

  6. Lebesgue's universal covering problem - Wikipedia

    en.wikipedia.org/wiki/Lebesgue's_universal...

    Lebesgue's universal covering problem is an unsolved problem in geometry that asks for the convex shape of smallest area that can cover every planar set of diameter one. The diameter of a set by definition is the least upper bound of the distances between all pairs of points in the set. A shape covers a set if it contains a congruent subset.

  7. Today’s ‘economic blackout’ began from an unlikely source ...

    www.aol.com/finance/today-economic-blackout...

    In recent posts, has advocated for the end of federal income tax, term limits in Congress, universal health care and price caps. ... The brand also angered left-leaning customers because of its ...

  8. Uniformization theorem - Wikipedia

    en.wikipedia.org/wiki/Uniformization_theorem

    Since every Riemann surface has a universal cover which is a simply connected Riemann surface, the uniformization theorem leads to a classification of Riemann surfaces into three types: those that have the Riemann sphere as universal cover ("elliptic"), those with the plane as universal cover ("parabolic") and those with the unit disk as ...

  9. Lean-to - Wikipedia

    en.wikipedia.org/wiki/Lean-to

    A lean-to addition is an appendix to an existing structure constructed to fulfill a new need. Sometimes, it covers an external staircase, as in a 15th century addition against one of the walls of the large chapter room of the cathedral of Meaux. Other uses include protecting entrances, or establishing covered markets outside existing buildings. [1]

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